tags got messed up and it came out as "pContent in posting/p" -- namely the angle brackets were stripped off.
I see in the network log that the description field got encoded this way:
<name>description</name>
<value><string><p>Hello, world!</p></string></value>
Was posted as:
David Herron test post #3
pHello, world!/p
As soon as I paste the youtube embed tags using Edit -> Paste HTML Source, that's when it triggers the "Please enter content" error.
The youtube embed tags were similarly encoded in the description field.
<name>description</name>
<value><string><p>Hello, world!</p>
<p><iframe src="http://www.youtube.com/embed/V9FOnkSLFBw" width="420" height="345" frameborder="0"></iframe></p></string></value>
It looks like you're new here. If you want to get involved, click one of these buttons!